SubscriptionService

An abstract TypeScript/JavaScript class that represents a Subscription.
A Subscribable must be passed to the constructor. But the subscription is not created until .set() is called on the instance. Every time the observable data is updated, it's passed to ._dataHandler().
You call .unsubscribe() on the instance when you need to.

Example

class UsersSubscriptionService extends SubscriptionService {

    constructor(__usersSubscribable) {
        super(__usersSubscribable);

        this._dataHandler = (data: Users) => {
            // log users to console:
            console.log(data);
        };
    }

}

const usersSubscription = new UsersSubscriptionService(usersSubscribable);
usersSubscription.set();

// later on...
usersSubscription.unsubscribe();

Constructor

constructor(__subscribable: Subscribable<any>)

Methods

set(): void
    // Calls .subscribe() on `__subscribable` passed to the constructor.
    // The subscription is saved in the instance.

unsubscribe(): void

protected  _dataHandler(data): void
    // Must be implemented in a subclass.
    // This is the handler called whenever there is an update
    // to the data subscribed to.

Installation

npm i @writetome51/subscription-service

Loading

// if using TypeScript:
import { SubscriptionService } from '@writetome51/subscription-service';
// if using ES5 JavaScript:
var SubscriptionService = 
    require('@writetome51/subscription-service').SubscriptionService;

License

MIT